Halawa KK, Gulo H. Development of Flashcard Learning Materials for the Excretory System Curriculum for 8th Grade Students at SMP Negeri 3 Lolofitu Moi Academic Year 2020/2021 . GB [Internet]. 2023 Dec. 20 [cited 2026 Jun. 20];1(2):71-8. Available from: https://ojs.unias.ac.id/index.php/gb/article/view/770